Improvement in steam-bojler-furnace crowns



L. H. WAUGH, J. A. HANGLIN & J. GRAHAM.

improvement in Steam-Boiler Furnace-Crowns.

N0.129,34. Patentedluly16`,1872.

.mmmm A 1532, L@ 'Vzw O (D EN UNITED STATES PATENT OFFICE.

LEE H. WAUGH, JOHN A. HANGLIN, AND JOHN GRAHAM, OF WYANDOTTE,

KANSAS.

IMPROVEMENT IN STEAM-BOILER-FURNACE CROWNS.

Specification forming part of Letters Patent No. 129,634, dated July 16,1872.

SPEcnrroATroN.

We, LEE H. WAUGH, JoHN A. HANGLIN, and J oHN GRAHAM, of the city ofWyandotte,

in the county of Wyandotte and State of `Kansas,`have invented certainImprovements a specification:

rJIhe main feature of our invention consists in a new method ofattaching the crown-bars of the fire-box to the crown-plate, so as tosupersede the necessity of washers around the bolts connecting the barsand plates, and which washers, in the present mode, rest upon the uppersurface of the crown-plate, and around which accumulates the scales fromthe upper surface of the rire-box and other substances, so as, inconnection with the washers, materially to affect the radiation of heatthrough the crown-plate to the water in the boiler.

The object of the invention is to prevent this accumulation, and, incase this should occur, that, in consequence of the smooth surface ofthe plate, the same can be easily removed by washing or otherwise.

Description of the Accompanying Drawing.

Figure 1 is a half-sectional end view of the crown-bars as attached tothe crown-plate of the fire-box. Fig. 2 is an end view of the fire-boxwith the crown-bars and the connecting bolts in proper position, withoutwashers on the crown-plate. Fig. 3 is a plan, showing the hollowcrown-bars with the heads of the connecting screwbolts. Fig. 4 is asolid crown-bar, the shaded section of which shows the perforations ascounterbored and the position of the connecting screw-bolt. Fig. 5 is anupper section of the solid crown-bar, showing the perforations for thebolts.

General Description. When the ordinary skeleton or double crown-bar D Dis used in connection with our square and seven-eighths of an inch inthickcorresponding perforations through the crownl plate,screw-threaded. These perforations are for the purpose ofreceiving aheaded screwbolt, threaded its entire length, passing through thecrown-bar into the crown-plate, by which they are rmly connectedtogether, as represented in Fig. 1 of the drawing, G C C C. Theseconnecting-bolts, at their upper ends, are properly headed, and restupon square pieces of iron, through which they pass, as seen in Fig. l,C G C C. The lower ends of these bolts are screwed through thecrown-plate and extend into the fire-box sufficiently to receive nuts ontheir lower ends, which are to be firmly screwed up to the crown-plate;or theV bolts may be riveted in the ordinary way to the plate.

When the crown-bars are not constructed as above described, but of onesolid piece of iron, the perforations are counterbored from the bottomof the crown-bar upward to seveneighths of an inch from the upper side.The

4space in the perforations, from the upper side of the crown-bar Lto thecounterboring, has the spiral groove, as above described, in relation tothe hollow crown-bars, and for the same purpose, as seen in the shadedsection of Fig. 4 of the drawing, D D. The proper adjusting of thescrew-bolts and their positions in the crown-bars and through thecrownplate, and their mode of fastening to the crown-plate in thenre-box, are substantially as above described.

1. The bolts 0 C, screwed both into the crown-bars and th crown-plate,for the pur- C C and crown-plate, as and for the purposes pose ofavoiding the use of Washers on the described.

top of the crown-plate, substantially as set L. H. WAUGH. forth. I J. A.HANGLIN.

2. The double crown-bars D D, connected Witnesses: J OHN GRAHAM. by theparts a a, provided with screW-thread- XV. J. BUCHAN,

edperforations, in combination Withthe bolts JOHN R. HALE.

